Change in Resistance due to Thermal Expansion

The filament of a lightbulb has a resistance of R0=12 Omegas at 20 degrees Celsius and 140 Omegas when hot.

a) Calculate the temperature of the filament when it is hot, and take into account the change in length and area of the filament due to thermal expansion (assume tungsten for which the thermal expansion coefficient is approx 5.5 * 10^ - 6 degrees Celsius^-1.